Hi there, I was using the Gstreamer framework (version 0.8) to get some tests. I used Gstreamer as client and VLC (0.9.4) as RTSP server and it worked smoothly. The problem has arised when updating Gstreamer to 0.10.21. When I launch "gst-launch-0.10 playbin uri=rtsp://IP:PORT/content it never starts playing the media. Using VLC as a client works ok. I can see with Wireshark the RTSP message exchange (PAUSE and then TEARDOWN) and I get these error messages where launching Gstreamer: Estableciendo el flujo a PAUSADO ... (PAUSED) El flujo es en vivo y no necesita PRECACHEADO ... (PRECACHED) Estableciendo el flujo para REPRODUCCIÓN ... (PLAY) New clock: GstSystemClock ERROR: desde el elemento /GstPlayBin:playbin0/GstDecodeBin:decodebin0/ffdec_mpegvideo:ffdec_mpegvideo0: Internal GStreamer error: negotiation problem. Please file a bug at <a href="http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer">http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer</a>. Información adicional de depurado: gstffmpegdec.c(2339): gst_ffmpegdec_chain (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0/ffdec_mpegvideo:ffdec_mpegvideo0: ffdec_mpegvideo: input format was not set before data start Execution ended after 887032082 ns. Estableciendo el flujo a PAUSADO ... Estableciendo pipeline a READY... Estableciendo pipeline a NULL... LIBERANDO pipeline ... (FREEING) I would like to know how I can solve this issue and, in case the only solution is downgrading to gstreamer 0.8, could anybody tell me where can I find it? By the way, as you may have noted, I am a newbie in the Gstreamer framework, but I am quite interested in succeedin using it. Any help would be much appreciated. Thank you, Javi